Income Taxes - Deferred Tax Assets (Details) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Assets:
Accrued expenses	$ 171,000	$ 126,000
Stock-based awards	53,000	83,000
Reserve for bad debts	51,000	29,000
Inventory reserve	65,000	12,000
Net operating loss carryforwards	26,000	0
Other	38,000	9,000
Valuation allowance	(31,000)	0
Total deferred tax assets	373,000	259,000
Deferred Tax Liabilities:
Depreciation	(400,000)	(322,000)
Prepaid expenses	(175,000)	(84,000)
Prepaid compensation	(3,000)	(52,000)
Total deferred tax liabilities	(578,000)	(458,000)
Net deferred income tax liabilities	$ (205,000)	$ (199,000)